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using System;
using System.Collections.Generic;
using Newtonsoft.Json;

namespace IdentityModel.Jwk
{
    /// <summary>
    /// Contains a collection of <see cref="JsonWebKey"/> that can be populated from a json string.
    /// </summary>
    public class JsonWebKeySet
    {
        private List<JsonWebKey> _keys = new List<JsonWebKey>();

        /// <summary>
        /// Initializes an new instance of <see cref="JsonWebKeySet"/>.
        /// </summary>
        public JsonWebKeySet()
        { }

        /// <summary>
        /// Initializes an new instance of <see cref="JsonWebKeySet"/> from a json string.
        /// </summary>
        /// <param name="json">a json string containing values.</param>
        /// <exception cref="ArgumentNullException">if 'json' is null or whitespace.</exception>
        public JsonWebKeySet(string json)
        {
            if (string.IsNullOrWhiteSpace(json)) throw new ArgumentNullException("json");

            var jwebKeys = JsonConvert.DeserializeObject<JsonWebKeySet>(json);
            _keys = jwebKeys._keys;
        }

        /// <summary>
        /// Gets the <see cref="IList{JsonWebKey}"/>.
        /// </summary>       
        public IList<JsonWebKey> Keys
        {
            get
            {
                return _keys;
            }
        }
    }
}